#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
    char ch = 0;
    while (scanf(" %c", &ch) != EOF)
    {
        if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
        {
            printf("%c is an alphabet.\n", ch);
        }
        else
        {
            printf("%c is not an alphabet.\n");
        }
    }

    return 0;
}